An extra-high voltage converter station of an overlapping architecture

Abstract

The application discloses an extra-high voltage converter station of an overlapping architecture, comprising a valve hall, a converter unit, a pole line unit, a starting loop, an AC field, a bridge resistance unit, a limiting resistance unit, a metal return line unit and a grounding pole outgoing line unit; the valve hall comprises a valve tower and a converter valve, the converter unit and the pole line unit are distributed on both sides of the valve hall to form a first layer architecture; the first layer architecture further comprises the metal return line unit, and the metal return line unit is arranged in the middle of the valve hall; the starting loop, the AC field, the bridge resistance unit, the limiting resistance unit and the grounding pole outgoing line unit form a second layer architecture; the starting loop and the AC field are arranged above the converter unit, and the starting loop is connected with the AC field; the bridge resistance unit, the limiting resistance unit and the grounding pole outgoing line unit are arranged above the pole line unit; the first layer architecture and the second layer architecture are connected through a support type platform. The application splits each region of the converter station, optimizes the space overlapping structure, improves the site utilization rate and saves the occupied area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of converter stations, and particularly relates to a UHV converter station with an overlapping architecture. BACKGROUND

[0002] The overall planning and general layout of a converter station are directly related to the construction investment benefit and the later operation quality of the converter station and related lines, and a reasonable electrical general layout is crucial for saving valuable land resources and ensuring smooth process flow of the converter station and convenient operation and maintenance. A conventional converter station mainly consists of a converter area, a DC field, an AC field and a station front area. Due to technical and economic limitations, the construction of a converter station requires certain space and terrain conditions. Renewable energy sources such as hydropower and photovoltaic are largely concentrated in high mountain and canyon areas, which have complex and diverse terrain, high altitude and large height difference, high seismic intensity, fragile ecological environment and frequent geological disasters, resulting in very limited and scattered available land resources suitable for station construction. At present, there is a lack of mature schemes for the design of UHV converter stations in high mountain and canyon areas. In the face of such complex situations, it is necessary to comprehensively consider adverse factors such as high altitude, high seismic intensity and large temperature difference, and to conduct type selection research on distribution devices. At the same time, under limited and complex terrain conditions, the distribution device areas are deeply arranged and optimized, and through research on the arrangement and land occupation, the land area is reduced, the construction difficulty is reduced, the converter station is more neat and beautiful, which is of great significance to improving the overall design level of the converter station.

[0003] The existing ±800kV UHV flexible DC converter station adopts a single-layer arrangement of open DC field equipment, and the ±800kV converter station converter area consists of high and low end valve halls, bridge arm reactor areas, high and low end coupling transformers and coupling transformer squares. The valve halls and coupling transformer areas consider a linear arrangement of high and low end valve halls and a linear arrangement of coupling transformers close to the valve halls. The coupling transformer square is located in the empty land between the valve halls and the AC distribution device, and the coupling transformer incoming line is located above the coupling transformer and is connected to the AC distribution device by overhead lines. The DC field adopts a typical UHV bipolar connection, and each valve group is provided with a bypass circuit breaker and a disconnector circuit. The DC field is arranged symmetrically according to the pole, and the DC neutral point equipment and the grounding pole outgoing line equipment are arranged in the center of the DC distribution device, and the DC high voltage pole line equipment is arranged on both sides of the DC distribution device. A DC bypass switch circuit device is arranged between each high and low end valve hall, and 1 bypass circuit breaker and 3 bypass disconnectors of each valve group form a back-shaped arrangement close to the valve hall and are connected to the valve hall equipment through a wall bushing. The neutral bus equipment and the grounding pole outgoing line equipment are arranged between the low end valve halls of the two poles. The AC distribution device selects a sulfur hexafluoride enclosed combined electrical apparatus (hereinafter referred to as GIS), and the low voltage distribution device and the amplitude phase corrector are arranged outdoors and arranged in a linear arrangement with the AC GIS equipment or arranged in the empty land between the AC field and the DC field.

[0004] Conventional flexible DC converter station layouts offer clear functional zoning, a relatively smooth process, and convenient operation and maintenance. However, this layout requires a large footprint. When implementing a planar layout on UHV sites in high mountains and valleys, the limitations of harsh terrain and the process requirements of electrical layout must be comprehensively considered, and the overall layout should be adapted to the site conditions as much as possible. Under these circumstances, some general modules and equipment selection principles are often no longer applicable; that is, conventional power distribution modules cannot adapt to complex terrain requirements, and conventional equipment selection cannot meet the actual needs of the project. Currently, there is a scheme to use DC GIS equipment to replace the conventional open DC field layout. This scheme can significantly reduce the footprint of the DC field. However, since areas such as the valve hall, converter transformer plaza, AC area, and station front area still require a large space, the overall space optimization for ±800kV flexible DC converter stations is relatively limited. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides an ultra-high voltage converter station with an overlapping architecture. Combining the power distribution equipment and site layout characteristics of a ±800kV flexible DC converter station, each area is divided and optimized using a spatial overlapping structure, which significantly improves site utilization and saves land area.

[0006] This invention provides an ultra-high voltage converter station with an overlapping architecture, the specific technical solution of which is as follows:

[0007] Includes valve hall, converter unit, pole line unit, start-up circuit, AC field, bridge reactor unit, limiting reactor unit, metallic return line unit, and grounding electrode output unit;

[0008] The valve hall includes a valve tower and a converter valve. The converter unit and the pole unit are distributed on both sides of the valve hall to form a first layer structure. The first layer structure also includes a metal return line unit, which is arranged in the middle of the valve hall.

[0009] The starting circuit, AC field, bridge reactor unit, limiting reactor unit, and grounding electrode output unit constitute the second layer architecture; the starting circuit and the AC field are located above the converter unit, and the starting circuit is connected to the AC field; the bridge reactor unit, limiting reactor unit, and grounding electrode output unit are located above the electrode unit; the limiting reactor unit is connected to the metal return line unit below; the bridge reactor unit and the grounding electrode unit are located on both sides of the limiting reactor unit;

[0010] The first layer architecture and the second layer architecture are constructed through a support platform. The support platform corresponding to the valve hall area is equipped with a DC through-wall bushing that vertically passes through the support platform where the valve hall area is located.

[0011] Furthermore, the converter unit includes a converter transformer, and the pole unit includes a smoothing reactor and a switching device.

[0012] Furthermore, the valve hall and the converter unit form a linear distribution structure, and the valve-side bushing of the converter transformer is directly inserted into the valve hall.

[0013] Furthermore, firewalls are provided between the converter transformers, and the output lines of the converter transformers are vertically connected to the supporting platform via GIL pipes.

[0014] Furthermore, the starting circuit includes a starting resistor and a surge arrester, and the starting circuit is connected in series with the converter transformer.

[0015] Furthermore, the AC field includes an indoor GIS, a station transformer, and an AC outgoing line structure. The starting circuit is located above the AC field and is connected to the indoor GIS of the AC field.

[0016] Furthermore, the outgoing line structure in the AC field is a 500kV AC outgoing line structure.

[0017] Furthermore, the bridge reactor unit includes a bridge arm reactor and a switching device; the limiting reactor unit includes a current limiting reactor, a disconnecting switch, a surge arrester, and a resistor; the grounding electrode unit includes a grounding electrode outgoing frame, a reactor, and a disconnecting switch.

[0018] Furthermore, the bridge reactor unit is connected to the pole unit via a GIL conduit or cable.

[0019] Furthermore, the DC through-wall bushing connects the valve tower outlet and the bridge arm reactor on both sides.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention divides the converter station's functional areas into the smallest units: valve hall, converter unit, pole line unit, start-up circuit, AC field, bridge reactor unit, limiting reactor unit, metal return line unit, and grounding electrode output unit. It also optimizes the layout by using a spatial overlapping structure and compactly arranges each area through GIS. The areas are electrically connected, which improves site utilization, facilitates operation and maintenance, and reduces the impact of terrain. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the converter station cross-sectional architecture of the present invention.

[0023] Figure 2 This is a schematic diagram of the first-layer architecture of the converter station of the present invention.

[0024] Figure 3 This is a schematic diagram of the second-layer architecture of the converter station of the present invention.

[0025] Explanation of reference numerals in the attached diagram: 1-valve hall, 101-valve tower, 2-pole line unit, 201-smoothing reactor, 3-bridge reactor unit, 4-starting circuit, 5-limiting reactor unit, 6-converter unit, 601-converter transformer, 7-grounding electrode outgoing frame, 8-metallic return line unit, 9-AC field, 901-AC outgoing frame. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention are clearly and completely described in the following description. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use, or the orientation or positional relationship in which those skilled in the art conventionally understand it during use. This is only for the convenience of describing the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention. Furthermore, the terms "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0029] Example 1

[0030] Embodiment 1 of the present invention discloses an ultra-high voltage converter station with an overlapping architecture, such as Figure 1 As shown, the details are as follows:

[0031] The converter station includes valve hall 1, converter unit 6, pole line unit 2, start-up circuit 4, AC field 9, bridge reactor unit 3, limiting reactor unit 5, metallic return line unit 8, and grounding electrode output unit;

[0032] Combination Figure 2As shown, the valve hall 1 includes a valve tower 101 and a converter valve. The converter unit 6 and the pole line unit 2 are distributed on both sides of the valve hall 1 to form a first layer structure. The first layer structure also includes a metal return line unit 8, which is arranged in the middle of the valve hall 1.

[0033] Based on the principles of main electrical wiring and ease of electrical wiring, the metal return wire is arranged at the bottom layer, between pole unit 2.

[0034] The converter unit 6 includes a converter transformer 601, and the pole unit 2 includes a smoothing reactor 201 and a switching device.

[0035] The valve hall 1 and the converter unit 6 form a linear distribution structure, and the valve side bushing of the converter transformer 601 is directly inserted into the valve hall 1.

[0036] Specifically, valve hall 1 includes two regions, corresponding to the two pole line unit 2 and the two bridge anti-unit 3, respectively, including the low-end valve hall 1 and the high-end valve hall 1.

[0037] Firewalls are provided between the converter transformers 601 in each valve hall 1. The 500kV outgoing lines of the converter transformers 601 are vertically connected to the supporting platform and the 500kV AC field 9 through GIL pipes (gas-insulated metal-enclosed transmission lines). The converter transformers 601 are arranged in a straight line outside the valve hall 1. After the valve side bushing is inserted into the valve hall 1, the connection is completed inside the valve hall 1.

[0038] Combination Figure 3 As shown, the starting circuit 4, AC field 9, bridge reactor unit 3, limiting reactor unit 5, and grounding electrode output unit constitute the second layer architecture;

[0039] The starting circuit 4 and the AC field 9 are located above the converter unit 6, and the starting circuit 4 is connected to the AC field 9;

[0040] The starting circuit 4 includes a starting resistor and a surge arrester, and the starting circuit 4 is connected in series with the converter transformer 601.

[0041] The bridge reactance unit 3, the limiting reactance unit 5, and the grounding electrode output unit are located above the electrode unit 2; the limiting reactance unit 5 is connected to the metal return line unit 8 below; the bridge reactance unit 3 and the grounding electrode unit are located on both sides of the limiting reactance unit 5;

[0042] The bridge reactor unit 3 includes a bridge arm reactor and a switching device; specifically, the boundary of the area where the bridge reactor unit 3 is located is aligned with the valve hall 1, and the bridge reactor unit 3 is connected to the pole unit 2 via a GIL conduit or cable.

[0043] Since the boundary of the bridge reactor area is aligned with the valve hall 1, the limiting reactor unit 5 and the grounding electrode output unit are placed in the blank space between the two bridge reactor areas. Hanging points are set on the edge of the upper platform, and the pole line unit 2 output is installed. The down conductor is connected to the pole line unit 2 at the bottom. Except for reactors and resistors, all equipment in the DC field is arranged in a compact manner using DC GIS equipment. Among them, pole line unit 2, metal return line unit 8, limiting reactor unit 5, bridge reactor unit 3 and grounding electrode output are the smallest units split from the DC field.

[0044] The current limiting unit 5 includes a current limiting reactor, a disconnecting switch, a surge arrester, and a resistor; the grounding electrode unit includes a grounding electrode outgoing frame 7, a reactor, and a disconnecting switch.

[0045] The first layer architecture and the second layer architecture are constructed through a support platform. The support platform corresponding to the area where the valve hall 1 is located is equipped with a DC through-wall bushing that vertically passes through the support platform where the valve hall 1 is located. The DC through-wall bushing is connected to the outlet of the valve tower 101 and the bridge arm reactor on both sides.

[0046] The AC field 9 includes an indoor GIS (sulfur hexafluoride enclosed combined electrical appliance), a station transformer, and an AC outgoing line frame 901. The starting circuit 4 is located above the AC field 9 and is connected to the indoor GIS of the AC field 9.

[0047] The outgoing line structure in AC field 9 is a 500kV AC outgoing line structure. Specifically, the 500kV AC power distribution equipment in AC field 9 adopts indoor GIS. The GIS room is 16m wide. The outgoing line voltage transformer is integrated into the GIS equipment. The surge arrester adopts an open-type device. The 500kV AC outgoing line structure is located on the roof of the GIS room. The starting circuit 4 is arranged above the GIS room. The entire AC field 9 platform is 25m wide. The area protruding from the firewall is reinforced with diagonal bracing.

[0048] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. An ultra-high voltage converter station with an overlapping architecture, characterized in that, Includes valve hall, converter unit, pole line unit, start-up circuit, AC field, bridge reactor unit, limiting reactor unit, metallic return line unit, and grounding electrode output unit; The valve hall includes a valve tower and a converter valve. The converter unit and the pole unit are distributed on both sides of the valve hall to form a first layer structure. The first layer structure also includes a metal return line unit, which is arranged in the middle of the valve hall. The starting circuit, AC field, bridge reactor unit, limiting reactor unit, and grounding electrode output unit constitute the second layer architecture; the starting circuit and the AC field are located above the converter unit, and the starting circuit is connected to the AC field; the bridge reactor unit, limiting reactor unit, and grounding electrode output unit are located above the electrode unit; the limiting reactor unit is connected to the metal return line unit below; the bridge reactor unit and the grounding electrode output unit are located on both sides of the limiting reactor unit; The first layer architecture and the second layer architecture are constructed through a support platform. The support platform corresponding to the valve hall area is equipped with a DC through-wall bushing that vertically passes through the support platform where the valve hall area is located.

2. The ultra-high voltage converter station with an overlapping architecture according to claim 1, characterized in that, The converter unit includes a converter transformer, and the pole unit includes a smoothing reactor and a switching device.

3. The ultra-high voltage converter station with an overlapping architecture according to claim 2, characterized in that, The valve hall and the converter unit form a linear distribution structure, and the valve side bushing of the converter transformer is directly inserted into the valve hall.

4. The ultra-high voltage converter station with an overlapping architecture according to claim 3, characterized in that, Firewalls are installed between the converter transformers, and the output lines of the converter transformers are vertically connected to the support platform via GIL pipes.

5. The ultra-high voltage converter station with an overlapping architecture according to claim 2, characterized in that, The starting circuit includes a starting resistor and a surge arrester, and the starting circuit is connected in series with the converter transformer.

6. The ultra-high voltage converter station with an overlapping architecture according to claim 1, characterized in that, The AC field includes an indoor GIS, a station transformer, and an AC outgoing line structure. The starting circuit is located above the AC field and is connected to the indoor GIS of the AC field.

7. The ultra-high voltage converter station with an overlapping architecture according to claim 6, characterized in that, The outgoing line structure in the AC field is a 500kV AC outgoing line structure.

8. The ultra-high voltage converter station with an overlapping architecture according to claim 1, characterized in that, The bridge reactor unit includes a bridge arm reactor and a switching device; the limiting reactor unit includes a current limiting reactor, a disconnecting switch, a surge arrester, and a resistor; the grounding electrode output unit includes a grounding electrode output frame, a reactor, and a disconnecting switch.

9. The ultra-high voltage converter station with an overlapping architecture according to claim 8, characterized in that, The bridge arrester unit is connected to the pole unit via a GIL conduit or cable.

10. The ultra-high voltage converter station with an overlapping architecture according to claim 9, characterized in that, The DC through-wall bushing connects the valve tower outlet and the bridge arm reactor on both sides.

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